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mysql.go
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mysql.go
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package main
import (
"database/sql"
"encoding/json"
"fmt"
"strconv"
"strings"
_ "github.com/go-sql-driver/mysql"
"github.com/urfave/cli"
)
var mysql *db
type db struct {
*sql.DB
}
//dsn_format: user:password@[protocol](address)/dbname
func FetchData(c *cli.Context) error {
conn, err := sql.Open("mysql", fmt.Sprintf("%s:%s@tcp(%s:%d)/?charset=utf8",
user, password, host, port))
if err != nil {
return err
}
row, err := conn.Query("select 1")
if err != nil {
return err
}
defer row.Close()
mysql = &db{conn}
metrics := []Metric{}
metrics = append(metrics, globalStatus()...)
metrics = append(metrics, slaveStatus()...)
res, _ := json.MarshalIndent(metrics, "", " ")
fmt.Println(string(res))
return nil
}
func globalStatus() []Metric {
rows, err := mysql.Query("SHOW GLOBAL STATUS")
if err != nil {
return nil
}
defer rows.Close()
var name string
var value float64
datas := []Metric{}
for rows.Next() {
if err := rows.Scan(&name, &value); err != nil {
continue
}
if m, ok := globalStatusKeys[name]; ok {
datas = append(datas, Metric{
Metric: fmt.Sprintf("mysql.%s", strings.ToLower(name)),
DataType: m,
Value: value,
Tags: map[string]string{
"port": strconv.Itoa(port),
},
})
}
}
return datas
}
func slaveStatus() []Metric {
rows, err := mysql.Query("SHOW SLAVE STATUS")
if err != nil {
return nil
}
if !rows.Next() {
return nil
}
defer rows.Close()
columns, _ := rows.Columns()
values := make([]interface{}, len(columns))
for i := range values {
var v sql.RawBytes
values[i] = &v
}
err = rows.Scan(values...)
if err != nil {
fmt.Println("scan error ", err.Error())
return nil
}
metrics := []Metric{}
for i, name := range columns {
bp := values[i].(*sql.RawBytes)
vs := string(*bp)
if dt, ok := slaveStatusKey[name]; ok {
var v float64
if vs == "Yes" {
v = 1
} else {
v, _ = strconv.ParseFloat(vs, 64)
}
metrics = append(metrics, Metric{
Metric: fmt.Sprintf("mysql.%s", strings.ToLower(name)),
DataType: dt,
Value: v,
Tags: map[string]string{
"port": strconv.Itoa(port),
},
})
}
}
return metrics
}